The Flag Renderer example addresses a typical graphical
need that can be answered with an SDM renderer. The need is to set
a decoration on a node that will always be visible, for example, if
the state of a model object changes and it needs to catch the user’s
attention. The renderer must display a flag on the node such that
the flag remains visible even if the object is hidden by another graphic
object.
The source code of the Flag renderer example is supplied
in the <installdir>/jviews-diagrammer89/codefragments/renderer directory
and described in this section.
The following figure shows an example of a flag on a
node, as it would be displayed by the Flag renderer.
An example of a flag displayed by the Flag renderer